Clutch.



J. S. EBBRT. CLUTCH.

APPLICATION FILED JULY 6, 1904-.

PATENTED MAR. 21, 1905 .e M512 asses v fizz/wafer.-

WM J4 llNiTEn STATES Patented March 21, 1905.

PATENT OFFICE.

CLUTCH.

SPECIFICATION forming part of Letters Patent No. 785,353, dated March21, 1905. Application filed July 6, 1904. Serial No. 215,473.

ments in Clutches, of which the following is a specification.

This invention relates to a clutch which may be readily manipulatedduring the rotation of either of its members and is not dependent uponfriction for effecting the coupling.

In the accompanyingdrawings, Figure 1 is a longitudinal section of myimproved clutch, showing it closed; Fig. 2, a similar section,

partly in side view and with part of the pulley broken away, showing theclutch open; Fig. 3, a detail of the clutch-operating mechanism; Fig.4., a cross-section on lineil, Fig.

1; Fig. 5, a similar section on line 5 5, Fig.

1; and Fig. 6, a section through part of the clutch-box.

The letter (t represents a clutch-box provided with an interiorcontinuous screw-thread. a. The clutch-box a may be made integral withthe pulley a and has a hub (4 loosely mounted on shaft A. WVithin theclutch-box a is contained a disk 7), having two pair of rails b, flankedby guides 5 Between these guides there are slidably fitted upon therails Z) a pair of radially-movable clutch-jaws c, the outer faces ofwhich are threaded, as at c, to engage thread a of box a. To operate thejaws a, I. mount upon shaft A aslidable sleeve d, which is held againstindependent rotation by groove-and-feather connection. To lugs (Z ofsleeve (Z are pivoted the inner ends of U-shaped links 6, the outer endsof which are pivoted to flanges c of jaws c at 6'.

Upon pivots 6' further turn the outer ends of U-shaped links f, theinner ends of which are fulcrumed at f to the rails b of disk I). Inthis way the jaws c are connected to the sleeve (Z as well as to thedisk 6. It will be seen that if the sleeve (Z is moved to the right,Fig. 1, the jaws 0 will be pushed outward to cause an engagement of thethreads 0 a and close the clutch. If the sleeve d is moved to the left,Fig. 2, the jaws will be drawn inward to become disengaged from box aand open the clutch.

The box a is closed by an annular cover 9,

which is screwed to the box and projects inwardly over jaws 0. Thus whenthe clutch is closed a rotation of pulley a in one direction will tendto screw the jaws 0 against lid 9, while if the pulley is rotated in theopposite direction the jaws will be screwed against rails 71. Thus ineither case a positive 'engagement of the two members of the clutch notdepending upon friction is effected.

The right-hand end of sleeve cl is notched to form a pair of claws 0Zthat straddle a notched hub b of disk 6, Fig. 5. The length of the claws(Z should be greater than the stroke of sleeve (Z, so that the sleevealways positively engages the disk. In this way the links cf will berelieved from strain.

In order to operate sleeved, I secure to shaft (0 by screw 72/ orotherwise a collar it, having a peripheral groove /2. Within this grooveis seated a yoke c, to which is fulcrumed at j a forked shipping-leverj. Links Z Z connect lever j to a ring on, sunk into the periphery ofsleeve cl. The lever j will,owing to its weight, hang downward, and.will therefore not be taken along by the rotation of shaft A. In thisway the yoke 2' and ring m will also remain at rest during the rotationof the shaft. By swinging the lever in one or the other direction thejaws 0 will be opened or closed and 'in this way the clutch may beoperated without the use of a separate stand.

It will be seen that my improved clutch is operated by interlocking thethreaded jaws c with the threaded box a or disengaging them therefromand is not dependent upon frictional contact between these parts.Consequently the clutch may be operated with a small expenditure ofpower even if the shaft is heavily loaded.

What I claim is 1. A clutch composed of a threaded box, an inclosed diskhaving rails and guides, radiallymovable threaded jaws engaging thesame, a slidable collar, and pivoted links connecting ring connected tothe shipping-lever, a grooved slidahle sleeve upon which the ring isseated, threaded radially-movable jaws, pivoted links for connecting thesleeve to the jaws, and a threaded box engaged by the jaws,substantially as specified.

Signed by me at New York city, (Manhat: 20

tan,) New York, this 5th day of July, 1904.

JOHN S. EBERT.

WVitnesses:

WILLIAM SoHULz, FRANK v. BRIESEN.

